body {
  margin: 0;
  font-family: system-ui, sans-serif;
  background: #f9f9f9;
  color: #333;
}

header {
  background: #224;
  color: white;
  padding: 1rem;
}

header nav a {
  color: white;
  margin-right: 1rem;
  text-decoration: none;
}

header nav a:hover {
  text-decoration: underline;
}

main {
  max-width: 800px;
  margin: 2rem auto;
  padding: 1rem;
  background: white;
  border-radius: 6px;
  box-shadow: 0 0 10px rgba(0,0,0,0.1);
  border: none;
}

@media screen and (max-width: 800px) {
  main {
    max-width: 100%;
  }
}



footer {
  padding: 1rem;
  text-align: center;
  border-top: 1px solid #ccc;
  position: sticky;
  bottom: 0;
}


.ad {
  background: #eee;
  padding: 1rem;
  text-align: center;
  min-height: 200px;
}

sl-card:not(:defined) {
  display: none;
}